Electric regulation.



J. L. UREVELING.

ELECTRIC REGULATION. APPLICATION FILED OUT. 11, 1910.

Patnted 0015.6,1914.

MGT M UNITED STA'1ES JOHN L. CBEVELING, OF NEW YORK, N. Y

ASSIGNOR T0 SAFETY CAR HEATING AND LIGHTING COMPANY, A CORPORATION' OF NEW JERSEY.

ELECTRIC REGULATION.

Specification of Letters Patent.-

Patented Oct. 6, 1914.

Application filed October 11, 1910. Serial N 0. 586,485.

To all whom it may concern:

Be it known that 1, JOHN L. CREVELING, a resident of New York, in the county and State of New York, have invented certain new and useful Improvements in Electric Regulation, as set forth in the annexed specification and drawing forming a part thereof.

My invention pertains to that class of electrical regulation wherein it is desired to automatically govern a dynamo or generator in a redetermined manner.

My invention has for its particular object to provide means whereby a dynamo or generator may be automatically governed to produce certain given results throughout widely varying conditions.

A further object of my invention is to provide means whereby a dynamo driven at variable speeds may be automatically regulated to properly charge a storage battery.

As my invention is particularly applicable to systems of electrical distribution wherein a dynamo driven at varying speeds is used to charge storage batteries and operate lamps or other translating devices, it will be described in reference to such a system.

The drawing is a diagrammatic representation of one type of such system embodying the essentials of my invention.

In the drawing '1 represents a dynamo or generator provided with afield winding 2, having in series therewith a means for controlling the field magnetization, in this instance illustrated as the carbon pile 3.

4 represents a lever normally drawn upwardly by the ad ustable spring 5, in such manner as to compress carbon pile 3 and reduce the resistance thereof.

6 represents a core of iron or other magnetic material attached to the lever 4 so that the motionof the core 6 is imparted by the lever 4 to carbon pile 3.

The positive terminal of the generator is carried as by lead 7 to the positive side of the storage battery 8 and lamps: or other translating devices indicated by 9. The negative side of the lamps or other'translating devices and the storage battery, are connected with the main 10 which is carried through the winding 11 to the negative brush of the generator 1.

12 is .az-solenoid so arranged that when energized, it will tend to draw the core 6 in a downward direction. One end of the solehold 12 is connected as by wire 13 with the lead 7. The other end of the solenoid is connected as by wire 14 with one end. of each of the carbon piles 15 and 17 having their opposite ends connected with lead 10 as by wires 16 and 18.

19 is a lever controlling the pressure upon the carbon pile 15 and normall drawn in an upward direction by adjustable spring 21 in such manner as to reduce the pressure upon the carbon pile l5, and increase the resistance thereof. The limit of such movement that may be given to the lever 19 is determined as by adjustable screw 20. The lever 19 is connected with the core of iron or other magnetic material,22,so related to the solenoid 11 that the said solenoid when energized, tends to draw the core .22 downwardly so as to increase the pressure upon the carbon pile 15 and reduce the resistance thereof.

23 represents a lever controlling the pressure upon the carbon pile 17, and normally drawn in an upward direction as by adjustable spring 25, the limit of motion that may be given to said lever by the spring 25 may be determined by adjustable screw 24. The lever 23 is provided with a core of magnetic material, 27, surrounded by the solenoid 26 in shunt across the battery, the coil 26 being so arranged that when energized it tends to draw core '27 downwardly, and increase the pressure upon the carbon pile 17 and reduce-the resistance thereof.

The operation of my invention is substantially as follows :If the generator be running at such speed that its electro-motive force is suflicient to cause it to deliver its normal maximum current output, the field coil 2 would perform its well-known function and the generator may be regulated by :variation of resistance 3 to hold this output constant, in a well-known manner. Current will tend to flow from the lead 7 to wire 13,

solenoid 12, wire 14.- and carbon piles 15 and 17, and wires 16 and 18 to the lead 10, and this current will cause the solenoid 12 to draw the core 6 downwardly against the action of spring 5 and reduce 'thepressure upon the carbon pile 3 and increaseithe resistance thereof, so as to out down the output of the generator. 12 will depend upon the resistance of the carbon piles 15 and 17, and I so adjust The action of the solenoid the spring 21 that when the maximum current output desired is reached, the solenoid 11 will attract the core 22 upon any further increase of output, in such manner as to decrease the resistance 15 and thus increase the current in the coil 12, in such manner as to hold the output of the generator from exceeding this predetermined limit throughout changes in speed or changes in load, and thus provide constant current regulation for the generator. I now so adjust the spring 25 that when the voltage upon the coil 26 reaches the maximum voltage desired to have impressed upon the mains, any increase above this voltage Wlll cause the core 27 to be drawn downwardly, and the resistance of the carbon pile l7 lowered in such manner as to increase the current in the coil 12 and increase the resistance 3 in such manner as to prevent the voltage of the generator exceeding this amount.

In practice, I usually so adjust the spring 25 that when the normal charged voltage is reached across the battery 8, the solenoid 26 will draw the core 27 downwardly upon any further increase and thus serve to hold this voltage from being exceeded. Therefore, before the battery reaches its normal fully charged voltage, this voltage will be required across the battery in order to force its charging current therethrough, and as its voltage cannot be exceeded, the charging current naturally tapers off to substantially zero, as the battery rises to this point, and then the system will operate as a constant potential system until the voltage of the battery be so lowered that the maximum current will be delivered by the generator at a voltage lower than the predetermined maximum, when the current from coil 11 will cause the system to be operated as a current controlling system, as above set forth, and

' it will be obvious'that the maximum load desired upon the generator can at no time be exceeded by increase in load upon the translation circuit or otherwise owing to the action of the coil 11.

I do not wish in any way to limit myself i to the details of construction oreXact mode of operation set forth herein, as I have merely shown a diagrammatic representation of one type of system embodying my invention, from which wide departure may be made without departing from the scope thereof, which is set forth in the following claims 1. Means for regulating a generator comprehending regulating means, a coil for operating the same, means for affecting the current in said coil operated by current fluctuations and means for affecting the current in said coil responsive to voltage fluctuations.

2. Means for regulating a generator comprehending a regulating element, a coil for controlling the same, means for controlling the current 1n said coil comprislng a current governing element and means .for affecting the said element comprehending acurrent operated magnet and additional means for afiecting the current in said coil comprising a current governing element and means for affecting said element comprehending a voltage operated magnet. 4

3. Means for regulating a generator comprehending a regulating element, a coil for operating the same, means for affecting the current in said coil comprehending a resistancevarying element and means governing the same responsive to current fluctuations and additional means. for affecting the current in said coil comprehending a resistance varying element and means responsive to voltage fluctuations for controlling the same.

4. Means for regulating a generator comprehending a regulating means electromagnetic means for controlling the same actuated by a coil, means for controlling the current in said coil comprehending a resistance varying element and means affecting the same affected by the current output of the generator and an additional resistance varying element and means affected by the voltage of the generator for controlling the resistance thereof.

5. Means for regulating a generator comprehending means for controlling the magnetization thereof, a coil for operating said means, and means for governing the current in said coil comprehending a resistance element and means responsive to current fluctuations for affecting the latter, and an additional resistance element affecting said coil, and means responsive to voltage fluctuations for aifecting said element.

6. The combination with a generator of means for governing the same, electro-magnetic means for controlling said governing means, an element for affecting said electromagnetic means, a current coil controlling said element, an additional element aifecting said electromagnetic means and a voltage coil controlling said element. 7. The combination with a generator of means for governing the same comprehending a governing element, means for controling the same comprising an actuating coil, means for controlling the current in said coil comprehending a plurality of variable resistance elements in circuit with said coil and current actuated means for varying the resistance of one of said elements and voltage actuated means for varying the resistance of another of said elements.

8. Means for regulating a generator comprehending a regulating element for affecting said generator, electromagnetic means for operating said element, means for afl'ectrent fluctuations and additional means for affecting said electromagnetic means responsive to voltage fluctuations. i

9. Means for regulating a generator, comv prehending a regulating element afiecting said generator, electromagnetic means for operating the same comprising a coil deriving current from said generator, a contro1- ling element for afiecting the current in said 10 coil, a coil responsive to current fluctuations JOHN L. CREVELING.

Witnesses:

ANITA E. TUERS, CHAS. MOO. CHAPMAN. 

